Hi , United Airlines ? This is Elizabeth parks calling . I have a reservation on the 2:30 p . m . flight to Shanghai this afternoon .   Yes , Miss Parks ? How may I help you ?   Well , I ’ d like to reschedule my flight for the tomorrow morning one at 9:05 . Is that possible ?   I ’ m very sorry , Miss Parks , but the 9:05 flight is completely booked . I can put you on a waiting list if you would like . 